Wikipedia
Optomux
Optomux is a serial ( RS-422/ RS485) network protocol originally developed by Opto 22 in 1982 which is used for industrial automation applications. Optomux is an ASCII protocol consisting of command messages and response messages containing data from an Optomux unit & contain a message checksum to ensure secure communications. The serial data link is very reliable, over distances up to 4,000 feet and is suitable for extreme safety applications. An Optomux system is typically made up of three main elements:
- There must be a host device to poll the Optomux brain boards.
- There are the brain boards themselves, anywhere from one to 255 of them.
- Each Optomux brain board attaches to an I/O mounting rack, carrying the individual I/O modules.